Lock a Orientation for App in XCode 6.1

In Project Settings should change into support orientation to Unlock(Tick-Mark) the all items.

The code used to one Time Orientation Lock. 

When run the (Portrait-Lock)code in your app, The app is support Autorotate Function. If you want to Autorotate, You can run the (Portrait-UnLock)code in your app. 

If want use in Single Page, Use the (Portrait-Lock)code in viewWillAppear (or) viewDidAppear and (Portrait-UnLock)code used in viewWillDisappear (or) Navigate Button (or) Back Button. 

AppDelegate.h File

@property (nonatomic) BOOL screenIsPortraitOnly;

AppDelegate.m File

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window

{

    NSUInteger orientations = UIInterfaceOrientationMaskPortrait;

    if (self.screenIsPortraitOnly)

    {

        return UIInterfaceOrientationMaskPortrait;

    }

    else

    {

        if(self.window.rootViewController)

        {

            UIViewController *presentedViewController = [[(UINavigationController *)self.window.rootViewController viewControllers] lastObject];

            orientations = [presentedViewController supportedInterfaceOrientations];

        }

        return orientations;

    }

}

ViewController.m File

//Orientation UnLock Code

-(void)viewWillAppear:(BOOL)animated

{

    [self portraitUnLock];

}

/**** or ****/

-(void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:true];

    [self portraitUnLock];

}

//Orientation Lock Code

-(void)viewWillDisappear:(BOOL)animated

{

    [self portraitLock];

}

/**** or ****/

//Button Code

- (IBAction)Back_Clicked:(id)sender

{

    [self portraitLock];

[self.navigationController popViewControllerAnimated:YES];

}

-(void)portraitLock

{

    AppDelegate* appDelegate = [UIApplication sharedApplication].delegate;

    appDelegate.screenIsPortraitOnly = true;

}

-(void)portraitUnLock

{

    AppDelegate* appDelegate = [UIApplication sharedApplication].delegate;

    appDelegate.screenIsPortraitOnly = false;

}